Vacuum relief plumbing fitting



FIG. 1 is a left side elevational view of a vacuum relief plumbing fitting showing our new design, the right side being a mirror image of the left side;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a vacuum relief plumbing fitting, as shown and described. 